/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;

namespace Lucene.Net.Analysis
{
	
    /// <summary>A TokenFilter is a TokenStream whose input is another token stream.
    /// <p>
    /// This is an abstract class.
	/// NOTE: subclasses must override at least one of {@link
	/// #Next()} or {@link #Next(Token)}.
	/// </summary>
    public abstract class TokenFilter : TokenStream
    {
        /// <summary>The source of tokens for this filter. </summary>
        protected internal TokenStream input;
		
        /// <summary>Construct a token stream filtering the given input. </summary>
        protected internal TokenFilter(TokenStream input)
        {
            this.input = input;
        }
		
        /// <summary>Close the input TokenStream. </summary>
        public override void  Close()
        {
            input.Close();
        }
    }
}